I have a postfix/dovecot mailserver setup, running fine. My problem is that different e-mail clients save sent e-mails in different folders. I realize that saving sent e-mail is not in the SMTP protocol, so my question doesn't regard that. I have installed Sieve succesfully in Dovecot but that only works on incoming mail (if I'm not mistaken).
Now my idea was to create a cronjob that moves all mails from different Sent folders to a 'default' one. So I want to select one 'default' Sent folder and move (not copy) all e-mails from alternative Sent folders to the default one on a regular basis, so that my users don't get confused over where to search for their sent e-mails on different clients. Can such a thing be done and if so, how would you approach it?
I'm not looking for a ready-cooked answer here, just some tips on how and where to start searching for information.